So, I noticed two more official quotes from GM that purposefully do not call the 2012 North American Aveo by name, instead referring to it as "Chevrolet's brand new small car" - eg. recently on the Orion Assembly Facebook page.
(See earlier thread: Aveo's future uncertain. Will GM keep or drop the name for North America? )
A quick search of the US Patent and Trademark Office database shows GM applied for a new vehicle name last month: Chevrolet Sonic. (Trademark serial # 85145025)
I'd be willing to bet that's the name the North American market is going to see in place of "Aveo" on the next generation car, to be revealed in Detroit in January.